import numpy as np
# Data: yearly salary in ($1000) [2017, 2018, 2019]
alice = [99, 101, 103]
bob = [110, 108, 105]
tim = [90, 88, 85]
salaries = np.array([alice, bob, tim])
taxation = np.array([[0.2, 0.25, 0.22],
                     [0.4, 0.5, 0.5],
                     [0.1, 0.2, 0.1]])

# 这是三个员工历年的收入，及历年的税率，求出税后最高的收入。


def calc():
    return None


def test_calc():
    assert calc() == 81.0
